Matrix Infinity Chip

A friend of mine installed a chip for me, the model is Matrix Infinity 1.53....It's been working fine for about 2 weeks but 2 days ago I turn it on and it wouldnt read any of my backsups or original, I tried unplugging tehe power, wouldnt help, but today It works again fine...now I;m thinking somehow I turned the chip off my accident and turned it back on again by accident... Does anybody know the proper way of handling these chips, like so I wouldnt turn it off again like I did before. The ps2 model that I have is 71000, which is the latest one I think.